Door-buffer.



D. F. OLIVER.

DOOR BUFFER.

APPLlcATIoN man :uw 19, 19u. nENEwEn sEPT.21. 191s.

Patenteupr. 3, 1917.

www XW Arm/mers DOCTOR FRANKLIN OLIVER, OFOAKILIAND, OALIYFORNIA.

noon-Burma.

Application filed. July 19, 1911, Serial No. 639,412.

To all whom, t may concern.'

Be it known that I, DOCTOR FRANKLIN Onrvinz, a citizen of vthe UnitedStates, and a resident of Oakland, in the county of Alameda and State ofCalifornia, have invented a new and Improved Dolor-Buiij'er, Ol"` whichthe following is a full, clear, and eXact description. f

The object of the invention is to provide a new and improved doorbuiier, arranged to offer a light res-istance to the door on closing thelatter. gently, and to oil-er a heavy 'resistance on slamming the door,thus preventing injury to the door and door casing, and reducingtheshock incident to the slamming of the door to a minimum.

For the purpose mentioned use is made of a lightresistance device,actuated on closing the door, a heavy resistance device, and aconnecting membermoving bodily with the said light resistance device andnormally out of engagement with the said heavy resistance device, thesaid connecting member moving into engagement with the said heavyresistance' device` on `forcibly actuating vthe light resistance devicewhen slamming thel door.

A practical embodiment of' the invention is represented in theaccompanying dra-w ings forming a part of this specification, in whichsimilar characters of reference indicate corresponding parts in all theviews. Figure l is a perspective view of the door buffer in position onthe free end of a door;

Fig. 2 is a side elevationl of thedoor buffer in position on the door,the latter being shown in section;

Fig. 3 is a sectional side elevation of the same; and l Fig. 4 is asectional plan view of the same as applied and showing the doorV at thepoint of closing. f f

The door buffer is mounted on a suitably constructed frame or casing Amortised-in the free end of the member B and secured to the latter byscrews or other suitable means. On the buffer casing A is mounted toslide a latch bolt C'having a beveled head C adapted to engage a plate Dattached to the casing E, so that when the door is closed the beveledhead C engages the plate l) to push the latch bolt C inward against thetension of a light resistance spring F arranged in the casing A andpressing the latch bolt G in a forward direction with a Specification ofIietters Patent.

Y Patented Apr. 3, 19t?. Renewed September 247, 1916. Serial No.122,579.

view to normally hold the head C projected beyond the free end of thedoor, as plainly indicated in the drawings. The outward movement of thelatch bolt C is limited by a stoppin C2 carried by the bolt andadapted'to abut against the front end of the buti'er casing AV (seeFigs.2 and 4).

The latch bolt C is provided within the casing A with an opening C3 inwhich extends a connecting member G provided on its top with teeth Gadapted to interlock with teeth I-I formed on a slide H mounted to slideon a bol-t'I held in the casing A and arranged parallel to the latchbolt C. The

slide H is pressed on by one end of a spring J coiled on the bolt I andabutting against the nut I ofthe bolt I, .and which nut serves to adjustthe tension of the spring J. The spring J is considerablyy heavier thanthe spring F' and it forms with the slide H a heavy resistance device incomparison with the light resistance device formed by the latch bolt Cand its spring F. rIhe slide H is held against turning on the bolt I bya lug or a p in K attached to the slide H and engaging an elongatedguideway A formed on the buffer casing A.

The forwardwall C4 of the opening C3 in the latch bolt C is madeVsshaped, and on it fits a V-shaped notch G2 formed on the forward endof the `connecting member G, which latter is also provided with aninclined slot *G3 through which extends a pin C5 forming part of thelatch bolt C.' It will be noted that the inclined walls of the slot of-thebolt meet atthe center of the bolt, while the inclined walls of thenotch of the connecting member meet at one side ofthe center of saidmember, consequently when the latch kbolt is pushed forcibly andsuddenly inward, the upper inclined wall thereof engaging the upper andlonger inclined wall of said member will with the pin C5 working intheinclined slot G3 of the member, causethe said member to be forcedupwardly to the position shown in Fig. .4 Normally the connecting memberG is in its lowermost position as indicated in Fig. 2, so. that theyteethG are free of the teeth H', and con-` sequently when the door B isgently closed and the latch bolt C is moved inwardly against thetensionrof its light spring F then the connecting member G simply moveswith the latch bolt C without changing its position'. When, however, thedoor B is slammed or forcibly closed then the forcible blow given to thelatch bolt C causes an upl ward movement of the connecting member Y.sistance is offered to the door when slamming the same. As soon as theforce in slamming the door is expended against the heavy resistancedevice, the spring J returns the slide H to normal position and theconnecting member G isnow free to drop by gravity and thus return tonormal position, that is, out of engagement with the slide H.

From the foregoingV it will be seen that the latch bolt C offers a lightresistance to the door on gently closing the same, but

when the door is slammed the heavy resistancel device is automaticallybrought into action so as to take up the shock incident to slamming thedoor, thereby preventing injury to the door casing and the wall in whichthe door casing is located. Byarranging the guideway for the connectingmember G in the latch bolt C in the manner described and shown in Fig.3, it is evident that when the connecting member G is actuated onslamming the door, it not only moves upward but also lengthwise and in areverse direction, to that in vvhich'the latch bolt C is moving at thetime, to cause a firm interlocking with the slide H as soon as possibleto bring the heavy resistance device into action.

The door buffer shown and described isv very simple and durable inconstruction, and is composed of comparatively few parts, not liableeasily to get out of order.

I do not claim broadly in this application a light resistance deviceactuated on closing the door with ordinary'force and a heavy resistancedevice controlled by thev light resistance device and operated therebyupon the door slamming, the same being claimed in the-companionapplication No. 637,27 8.

Having thus described my invention, I claim as new and desire to secureby Letters Patent:

1. A door buer, comprising a latch bolt, a light resistance device forthe bolt, aI heavy resistance device, and a connecting member movingbodily with the said light resistance device and normally out ofengagement with the said heavy resistance device, the said connectingmember moving into engagement with the said heavy resistance device onforcibly actuating the light resistance device when slamming the door.

2. A` door buffer, comprising a latch bolt,l

resistance devices, one acting on the bolt and provided with a lightspring and the other adjacent the bolt and provided with a heavy spring,and a connecting member carried by the said light spring resistancedevice and out of engagement with the said heavy spring resistancedevice on gently closing the door, the said connecting member movinginto engagement with the said heavy spring resistance device on forciblyactuating the said light spring resistance device when slamming thedoor.

3. A door buffer, comprising a latch bolt, a light spring pressing thesame, a heavy spring resistance device adjacent the said latch bolt, anda connecting member carried by the said latch bolt and normally inactiveon gently closing the door, the said connecting member being movable onthe latch bolt and adapted to engage the said heavy spring resistance onforcibly actuating the said latch bolt when slamming the door.

4. A door buffer, comprising a latch bolt, a light spring pressing thesaid bolt to hold it in projected position, a connecting member mountedto slide lengthwise and upward on the latch bolt, and a heavy resistancedevice adjacent the said latch bolt and adapted to be engaged by thesaid connecting member on forcibly actuating the latch bolt whenslamming the door.

5. A door buffer, comprising a latch bolt, a light spring pressing thesaid bolt to hold it in projected position, a connecting member mountedto `slide lengthwise and upward on the latch bolt, a slide adjacent tothe said latch bolt and adapted to be engaged by the said connectingmember, and a heavy spring pressing the said slide.

6. A doorbuifer, comprising a latch bolt, a light spring pressing thesaid bolt to hold it in projected position, a connecting member mountedto slide lengthwise and upward on the latch bolt and provided with teethat the outer face, a slide adjacent the said latch bolt and providedwith teeth adapted to be engaged by the teeth of the said slide, and aheavy spring pressing the said slide.

7. A door buffer, comprising a casing, a latch bolt mounted to slide onthe said casing and provided with guideways, a light spring pressing thesaid latch bolt, a connecting member mounted to slide on the said latchbolt and provided with teeth, a resistance slide mounted in the saidcasing and provided with teeth adapted to be engaged by the teeth on thesaid connecting member, and a heavy spring pressing the said slide.

8. A door buffer, comprising two sliding device operated by the springactuated latch with which the bolt is engageable When the bolt When thelatter is suddenly and forcibly latter is suddenly and forcibly pressedinpushed inward. Ward.

10. In a door buffer, the combination with In .testimony whereof I havesigned my 5 a sliding and spring actuated latch bolt, of name to thisspecification in the presence of 15 a resistance device and means forconnecting t\vo subscribing Witnesses.

the bolt with the resistance device, when the DOCTOR FRANKLIN OLIVER.bolt is suddenly forcibly pushed inward. Witnesses:

1l. In a door bu'er7 the combination of THEO. G. HosTER, lo a slidinglatch bolt, and a resistance device JOI-IN I). DAVIS.

Copies of this patent may be obtained for five cents each, byaddressing' the "Commissioner of Patent, Washington, 1D. C.

